Il A heavy ball with a weicht of 100 N (m 10.2 kg) is hung. from the ceiling of a lecture hall on a 4.5-m-long rope. The ball. is pulled to one side and released to swing as a pendulum, reach-. ing a speed of 5.5 m/s as it passes throuoh the lowest point.
Inventions. The huochong gun was invented in China during the Ming dynasty. It was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.t was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.
(The Magnetic Compass invented in the 1st century by people in the Han Dynasty). The Magnetic Compass was created early in the 1st century CE when a man in China noticed that lodestone acted like a magnet and could be used to show direction.Back then the compass looked completely different than it does today.nother great invention in the Han Dynasty time period is paper. Paper was created in the 2nd century BCE. Before paper scholars were writing on rolls of silk which was not a bad source for writing.